Beefy Boxes and Bandwidth Generously Provided by pair Networks
No such thing as a small change

Comment on

( #3333=superdoc: print w/replies, xml ) Need Help??

Totally ++. This is both brilliant and scary.

However, it's so unusual that I think it would be hard to follow -- more so than many other idioms. I think I'd put a space into it rather than treat it as an "operator":

( 'admin' ) x !!$is_admin_link,

I think that will be more intelligible to those who aren't familiar with the idiom.

Also, because of the way this works for arrays, you might want to call this the "()x!!" operator -- though a pithy visual metaphor escapes me. Consider:

use strict; use warnings; my $cond = 0; my @foo = 'foo'; my @bar = ( 'bar', @foo x !!$cond, 'baz' ); print join(q{,},@bar), "\n"; @bar = ( 'bar', (@foo) x !!$cond, 'baz' ); print join(q{,},@bar), "\n";


bar,,baz bar,baz

Teaching people to always use the () may save them from expected results.


Code written by xdg and posted on PerlMonks is public domain. It is provided as is with no warranties, express or implied, of any kind. Posted code may not have been tested. Use of posted code is at your own risk.

In reply to Re: Secret Perl Operators: the boolean list squash operator, x!! by xdg
in thread Secret Perl Operators: the boolean list squash operator, x!! by Aristotle

Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":

  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.
  • Log In?

    What's my password?
    Create A New User
    [Discipulus]: good morning marto! a better weekend? i hope

    How do I use this? | Other CB clients
    Other Users?
    Others chilling in the Monastery: (7)
    As of 2018-05-21 07:55 GMT
    Find Nodes?
      Voting Booth?